ESS Image


ESS - Keep Batteries Charged in United States?


I am in the US using Multiplus-II + CerboGX in a RV setup with batteries, solar, and shore power. I would like to use shore power to power loads, charge the battery. When I have solar, I would like to use solar first and reduce my shore power load, but NOT feed any excess power to the grid.

This aligns with "Connect to mains, no Feedback" in Self-consumption Hub-1. But the materials say that is deprecated in favor of ESS. This aligns with "Keep Batteries charged" in ESS. However, I can't install ESS without selecting a grid code... and there is no Grid code in for the USA.

Solar priority seems like a common configuration with other solar/inverter systems, how do I do this with Victron?

johnny-lee asked
JohnC answered ·

1 Answer

Only charge batteries when the grid is overloaded In ESS

hello, in my situation there is an overload of the grid in the region causing the grid connected inverters to fail due to overvoltage.

at the moment this happens the batteries are already fully charged, so my question is, is there a way to configure ess in such a way that the batteries are only charged at a mains voltage above 253v? so that the batteries are used as a dumpload?



2x multiplus2 48/3000 parallel

2000Wp DC coupled(mppt)

4500Wp connected to grid(measured by em24s)

1500Wp AC coupled

ESS parallel (em24 in meter box)

lithium storage 14kwh (2-wire bms)

thanks in advance!

tommas asked
tnt369 answered ·

1 Answer

Propose suggestion for ESS "Auto Recharge" settings

I understand there are charging schedules, but I dont see anything that would automatically prevent an auto recharge. Such as "SoC has been below SoC limit for more than 24 hours" or "Recharge, SOC dropped 5% or more below MinSOC". For instance, If its two hours before typical peak sunlight time. I dont want an auto recharge right before max PV input. Give the panels a chance to charge the batteries. If this fails then recharge at some off peak hours (night?). This would seem to maximize efficiency.

Suggestions or comments?

Similar to this previous feature request

elvis asked

0 Answers

Gx doesn't discharge battery at night


I'm new here, thank you for having me.
We are running a victron setup for a few weeks now. So not very experienced yet.
The setup we are using is 3 multiplus units (48/5000) for a 3 phase network (+ carlo gavazzi energy meter) and a mppt 450/100 unit as PV charger.

The problem is that the battery only discharges when the solar panels are charging the batteries.
When the battery has 74% at night, it will still have 74% the next morning.

Why doesn't it discharge in stead of using the grid?
Maybe a small setting but can't find it at the moment.

Thank you in advance!

Best regards

g320 asked
ejrossouw answered ·

5 Answers

Discrepancy between Grid Setpoint shown in VenusOS and the actual power drawn from the grid (and some other problems in using ESS)

I am new to Victron products and have started setting up a 48V LiFeP04 battery system with a MultiPlus II 48/5000/70-50. In phase 1, my target now is to store electricity from the grid to the battery pack during low rate period at night and then use the stored electricity during day time. I am planning to add a PV system in phase 2 after I have got familiar with the Victron products.

Below is the diagram of my setup:



In VEConfig, I have the following settings:

TAB: General

System frequency 50Hz

Shore current 100.0 A

Overruled by remote unchecked

Dynamic current limiter unchecked

External current sensor connected (see manual) checked

State of charge when Bulk finished 90.0 %

Battery capacity 277 Ah

Charge efficiency 0.95

TAB: Grid

Country / grid code standard UK: G98/1 March 2019, G99/1 May 2018

LOM detection AC input 1 Type B (grid code compliant)

start P(f) at 50.40 Hz

start delay for p(F) 0.08 s

Droop for p(F) 10.0 %

Use Aux1 (if available) as disable FeedIn signal checked

Reactive power regulation Use a fixed Cos Phi

Filter time for reactive power 3.3 s

Cos phi at point 1 1.00

TAB: Inverter

PowerAssist unchecked

Inverter output voltage 230 V

Inverter DC shut-down voltage 48.00 V

Inverter DC restart voltage 50.00 V

Low DC alarm level 49.00 V

Do not restart after short-circuit (VDE 2510-2 safety) unchecked

enable AES unchecked

TAB: Charger

Enable charger checked

Weak AC input unchecked

Stop after excessive bulk checked

Lithium batteries checked

Configured for VE.Bus BMS unchecked

Charge curve Fixed

Absorption voltage 55.00 V

Float voltage 52.00 V

Charge current 70 A

Repeated absorption time 1.00 Hr

Repeated absorption interval 7.00 Days

Absorption time 1 Hr

TAB: Virtual switch

TAB: Usage

Virtual switch usage Do not use VS

TAB: Assistants

TAB: Assistant Configuration

ESS (Energy Storage System) (size:962)

*) System uses LiFePo4 with other type BMS

(This can be either a BMS connected via CAN bus or a BMS system in which the

batteries are protected from high/low cell voltages by external equipment.)

*) The battery capacity of the system is 277 Ah.

*) Sustain voltage 49.00 V.

*) Cut off voltage for a discharge current of:

0.005 C= 48.00 V

0.25 C= 48.00 V

0.7 C= 48.00 V

2 C= 48.00 V

*) Inverting is allowed again when voltage rises 2.00 V above cut-off(0).

*) Relevant VEConfigure settings:

- Battery capacity 277 Ah.

- PowerAssist unchecked

- Lithium batteries checked

- Dynamic current limiter unchecked

- Storage mode unchecked

In VenusOS - ESS, I have the following settings:



From the VenusOS screen shown below, it seems that the ESS system was working properly as per my expectation that:

  1. Discharge the battery to supply the loads of the house
  2. The grid setpoint was kept at around 50W


However, I have the following queries (or encountered some problems):

  1. While the VenusOS screen showed that the grid setpoint was kept at around 50W, a clamp ammeter at the CT point location showed that the grid was supplying 2.3A (i.e. around 520W) to the house at the same moment. That was 10 times larger than the grid setpoint. When the house asked for more load, the grid setpoint in the VenusOS screen still showed 50W and the clamp ammeter also showed around 2.3A. It seems that ESS thought that it was keeping the grid setpoint at 50W but in fact the power supplied from the grid was much more than that. What was causing such discrepancy? (Note: The chance of a faulty CT is low because I tried 2 CTs. Both had the same result.)
  2. Before the turning on of the MP-II, the clamp ammeter showed that the house was drawing 2.7A from the grid. After the MP-II was turned on, ESS then worked as shown in the above VenusOS screen. In that screen, you can see that the battery was giving 424W. The grid was giving (from the clamp ammeter) 2.3A or 529W at the same moment and therefore the total was 424 + 529 = 952W. However, before the turning on of the MP-II, the house was only using 2.7A or 621W. There was a more than 300W differences. Did it mean that the MP-II was itself eating up 300W? Or, such confusing figures were also caused by the cause of problem 1 above?
  3. In the VenusOS screen, only one “AC Load” was shown. I got that the "AC Load" shown also included the load connected to AC-Out1 (i.e. the critical load). Is it possible to show the load at AC-Out1 in a separated box? If yes, how?

Thank you very much in advance for any help/advice.

elel asked
Paul B edited ·

1 Answer

ESS flapping between absorption and discharging

In the ESS System, when there is a stable situation with enogh exceeding energy - Bulk Charging is working well – but as soon as the batteries are sufficiently charged to switch to absorption, the Multiplus is flapping between absorption and inverter (discharge) mode in changing intervals of 10sec to 1 minute and with changing amplitudes up to +/- 10 Amps. I would expect a stable absorption mode with constant voltage and decreasing current for the configured absorption time of 2 hours – but no negative current at all.
I already have posted the problem in german language "ESS springt zwischen Absorption und Discharge alle paar Sekunden" but unfortunately no solution yet and therefore i repost in english language and with extended documentation.
I have done a lot of measurements and tests - see attached documentation also including configuration parameters. 2022 01 14 Absorbtion Problem Doku.pdf

Looking forward to your recommendations - Manfred

manfred-1 asked
manfred-1 commented ·

1 Answer

ESS back to grid threshold changes from day to day

Hi (newbie here)

I've opened a new post as I believe this is the correct way to address a question with a unique setup, apologies in advance if I'm doing this incorrectly. I've also taken previous advice into consideration but I need some help in the correct setup if I have done this wrong ?

Some days ESS seems to work perfectly using battery overnight (Self Consumption) other nights it goes into sustain mode early in the discharge cycle and uses the grid to slowly recharge over hrs (around 8 hrs).

I understand voltage is an important threshold but not sure where this can be set as I can only find SOC (back to grid) threshold in the ESS settings.

I don't understand how a totally different thresholds (sustain level) chang from day to day.

(I'm using a 5Kva MP IIGX, ESS (min SOC -20%) in 'Non-battery life mode', with 5Kva LifePro4 battery, 15 330w panels.

A: The three overnight discharge examples (good and bad) and early sustain at 80%) are as below, I would appreciate any help.

B: After watching several ESS webinars I understand ESS has several modes 1, 2 & 3 but Im not sure where these are set, IE in the assistant or in remote control?

(sorry I didn't want to start a new post on a similar topic)






VE Config Extract from MPII 5KVAGX

AB: GeneralSystem frequency 50Hz

Shore current 50.0 A

Overruled by remote checked

Dynamic current limiter unchecked

External current sensor connected (see manual) unchecked

State of charge when Bulk finished 95.0 %

Battery capacity 100 Ah

Charge efficiency 0.95 TAB: Grid

Country / grid code standard Other: not compliant to any grid code standard

LOM detection AC input 1 Type B (safe)

Accept wide input frequency range (45-65 Hz) checked

AC low switch mains off 180 V

AC low switch mains on 187 V

AC high switch mains on 265 V

AC high switch mains off 270 V

UPS function checkedTAB: Inverter

PowerAssist unchecked

Inverter output voltage 230 V

State Of Charge shut-down 10.0 %

State Of Charge restart 20.0 %

Inverter DC shut-down voltage 43.00 V

Inverter DC restart voltage 45.00 V

Low DC alarm level 44.00 V

Do not restart after short-circuit (VDE 2510-2 safety) unchecked

enable AES uncheckedTAB: Charger

Enable charger checked

Weak AC input unchecked

Stop after excessive bulk unchecked

Lithium batteries checked

Configured for VE.Bus BMS unchecked

Charge curve Fixed

Absorption voltage 56.80 V

Float voltage 54.00 V

Charge current 70 A

Repeated absorption time 1.00 Hr

Repeated absorption interval 7.00 Days

Absorption time 1 HrTAB: Virtual switch

TAB: Usage

Virtual switch usage Do not use VS

TAB: Assistants

TAB: Assistant Configuration

ESS (Energy Storage System) (size:964)

*) System uses LiFePo4 with other type BMS

(This can be either a BMS connected via CAN bus or a BMS system in which the

batteries are protected from high/low cell voltages by external equipment.)

*) The battery capacity of the system is 100 Ah.

*) Sustain voltage 50.00 V.

*) Cut off voltage for a discharge current of:

0.005 C= 44.20 V

0.25 C= 43.55 V

0.7 C= 42.25 V

2 C= 42.00 V

*) Inverting is allowed again when voltage rises 1.20 V above cut-off(0).

*) Relevant VEConfigure settings:

- Battery capacity 100 Ah.

- PowerAssist unchecked

- Lithium batteries checked

- Dynamic current limiter unchecked

- Storage mode unchecked

Additional Settings


Additional info: My 5Kva battery is a Hubble AM2 (local battery built on new BYD LifePro4 cells and using Pylontech compatible interface).

The GX sees the battery config via CAN bus,


alan-falck asked
alan-falck edited ·

11 Answers

Time delay grid sync

I am needing to add a time delay for a MPii to sync and accept grid power. The scenario is that some gated estates in South Africa require 15-20min delay before inverters are allowed to sync to the grid after a grid failure to stagger and limit power draw on the infrastructure.

I know this is possible and there are a couple of other threads out there but the instructions are not very clear on how to setup the assistants and in what order. We also use ESS and South Africa Grid code.


mauromartini asked
Matthias Lange - DE commented ·

2 Answers

Restart in Island Mode with low battery and AC coupled PV

Assume the following:
Over night the power is drawn from the batteries, coupled with the inverters, to a point were it reached the low level of the battery, hence the inverts stop working - power goes out. The PV inverter is AC-coupled.

How is this system supposed to restart as soon as the sun has sufficiently risen?

The AC-out has no island grid up, so the PV inverter will not input power. The GX does not know that the PV inverter could provide enough power to load the battery and power the load (and its not terrible reliable I guess).

My working assumption is that I have to manually restart the vicron system once I am aware that the sun is reliable enough to keep the system up, but as the power from the grid is not availale and the battery is on low (e.g. 5%) - will this even work? Or is this the case were you either need a gen-set or at least some DC-coupled PV panels with MPPT?

sesshoumaru asked
sesshoumaru commented ·

3 Answers

Issue with ESS taking power from Grid


I am an installer who has installed THIS system more than 30 times. Total of about 60 installs on VRM.

The problem is ESS keeps on taking power from grid instead of DC/battery/PV. Day and night. It also does not export power to 'non-essential' loads ("AC Loads" as per VRM).


We have:

  • MultiPlus II 48/5000/70
  • Smart Solar 250/70
  • Lynx Distributor
  • Cerbo GX + Touch
  • ET112
  • Freedom Won 5/4 battery


  • See attached VE.Config file.20220106 MPII 48-5000-70
  • ESS as per manual for Freedom Won, set to 35% SoC in 'with battery life'
  • DVCC as per manual (I will gladly give access to VRM if needed)
  • NRS097 country code selected
  • Victron cables, no crimped cables

What I have done so far:

  • All items display 100% correct on Cerbo (MultiPlus, MTTP and Battery)
  • Contacted 2 Victron distributors, neither can help me (one who I bought the inverter from, and the other the battery);
  • We had the latest firmware on inverter, but distributor recommended to roll back to 481 (last stable version) to test, not difference;
  • Check all AC cables one by one;
  • System work 100% when AC is disconnected;
  • If I discharge batteries, and chage ESS to 'keep batteries charged' it works 100% to charge from grid;
  • Tried it both with and without 'battery life';
  • I checked all RJ45 cables with a tester, even tried a new cable between inverter and Cerbo;
  • exchanged the Cerbo;
  • I have bought another MPII, but distributor told me I would waste my time, try the community first;

I understand the normally way for anyone to help me is to check basics, and I know I might have not given all info one might need to check all this. I will gladly comply, pictures, just ask. However, have spend 2 days checking everything over and over. I am convinced it is something else I might have missed. I hope another installer of someone from Victron has come across this, as both my distributors who is massive in RSA, is stumped.

Schalk van der Merwe asked
Schalk van der Merwe commented ·

4 Answers

Backup power extension to existing battery system

Hi there,

I have the following system:

"Sonnen" ECO8 12kW storage

SolarEdge Inverter: SE9K-ER-01-ENG

9.9 kWp modules

Emergency power box from the company "Sonnen" (single-phase, not black start-capable) with mains disconnection.

Why "Sonnen": They have a LiFePo4 battery and had an attractive flat rate (ends August 2022 :( ).

Unfortunately, the system cannot start black - according to service, not with the new emergency power box, which could also do this with a new memory generation from "Sonnen". But that is not compatible with my system.

Is there a way with Victron Energy to use the existing PV with their battery?

Thanks in advance for all ideas


mich31 asked
mich31 edited ·

2 Answers

Quattro AC-out control

This may sound like a weird question, ... I understood from the Quattro's documentation that AC-2-out is only supplied with power if either AC-in-1 or/and AC-in-2 have an active source connected. However, can this be changed or is it fixed that way?

I idea would be that in case of grid failure (AC-in-1, AC-in-2 being genset off by default) the Victron system checks if it can supply both AC-outs and if so, both stay on. If one inverter (3-phase-system) is going to overloaded, then AC-out-2 is dropped.

Once AC-out-2 is dropped, I would like to ensure that once at least one AC-in is back (e.g. Genset kicks in) or I decide manually to try, that AC-out-2 is put back on. Is that possible (maybe with Assistants) or too far-fetched?

As always, thanks for taking time :)

sesshoumaru asked
sesshoumaru commented ·

1 Answer

Limit grid battery charge current when AC-coupled

So, this has been asked before:

But I'm piling on with a related problem: In Cape Town, grid-tied hybrid (i.e.ESS-like systems) are not allowed to charge the batteries from the grid by more than 25% of the main breaker capacity.

So, for a 60A breaker, I need to limit the grid usage for battery charging to 15A. I know I can limit the charge current and it will work fine when combined with DC-coupled MPPTs which can charge the battery directly with no limit.

However, in my case I have an AC-coupled Fronius on the output of the Multi, so I want the Multi to charge at full capacity when using solar, and 15A when those amps are coming from the grid. It does not seem possible to limit "grid amps for battery charging" in that configuration. Everything limits the entire charging process or the entire pass-through current, even from solar.

Any way to achieve this?

(In ESS, charging from the grid is rare, but when it happens I need it to be limited to 15A to comply with regulations, without harming overall system performance.)

Marius Marais asked
roland-trautner answered ·

4 Answers

Supply AC loads instead of charging - behavior on cloudy days

I'm using

  • VenusOS 2.73 on Raspberry Pi
  • ESS
  • Multiplus II 48/3500/35
  • SmartSolar Charger MPPT 250/70 rev2
  • Pylontech US2000C batteries (7.2kWh)

On cloudy days, when there is a less energy from PV and the battery is already at "empty" (ESS#1), all the energy is used to charge the battery and AC loads (+critical loads) and supplied completely from the grid.


When the minimum soc level +3 is reached and ESS#1 is gone, the AC loads are supplied from PV and battery.

When the PV power is less than the AC loads (see number in the picture above), the battery will be discharged again.

Then after a few hours, the minimum soc level is reached again, ESS#1 is raised and all AC loads are supplied from grid again. And all PV power is used to recharge the battery.

This leads to continuous charging and discharging of the battery, on some days multiple cycles per day.

What I want to configure/do is, that in ESS#1 state, all the PV power is used to supply AC loads (+critical loads).

Just the excess energy should be used to charge the battery.

This would lower or even prevent the described charge-discharge cycles and it would increase the efficiency, since the energy is not stored in battery first, but is used immediately.

I'm familiar with coding, so if there is no config-way to achieve it, there may be a way coding way to achieve it.

doubh asked
d3-energy commented ·

3 Answers

LG Chem RESU Plus and Multi Plus 2 not inverting

Been running a ESS system for some years, Multi Plus 2 and LG Chem RESU 6.5, it's all been working fine.

To add more capacity i have added a RESU 10 via a RESU Plus (bonding the two batteries togeather).

I have changed the capacity in VE Configure = to 315 Ah (sum of the two batteries). Changed the relevant DIP switches on the batteries.

Also running colour GX, the battery is recognised, and last night scheduled charge worked as expected. However the inverter will not invert. Grid power = AC load and battery is not discharged.

I have reconfigured the battery DIPs, connected directly to the inverter (not via RESU PLUS) and system works as expected with each battery in turn.

I have asked LG Chem for the latest BMS firmware, but in the mean time any ideas?

k2aab asked
k2aab edited ·

0 Answers

2 Answers

Ohmpilot in ESS with Multi/Quattro and Fronius Primo on AC output


Main reason why I'm asking this is because ESS manual says the Fronius SmartMeter can't be used in Victron/Fronius ESS setup.

My goal is to use PV power mainly and primarily to produce heat (second to use the surplus, third to store the surplus).

My idea was to set up the system like in the diagram attached and configure Victron ESS with "control without grid meter" = OFF


The Fronius SmartMeter would only be used for the Ohmpilot to know how much energy can be used for the boiler (Surplus = "PV engergy" - "Critical loads energy")

My questions are:

- Will this have an impact on Victron/Fronius ESS setup?

- Will Fronius Zero feed-in still work?

Many thanks for your thoughts and Merry Christmas!! Mike

freytshy asked
Agropensiunea Cerna commented ·

4 Answers

Activate 3 dump load when I export 500w 1000w and 1500w


I would like to activate 3 dump load when I export 500w 1000w and 1500w

is it possible? I have read everything I have been able to find without any luck. I have an ESS with a MultiPlus2 48/3000/35/32 and a Cerbo GX and mains connected 2500w solar system.

Regards Jens

jens-due asked
bbmz answered ·

2 Answers

Sizing inverter/charger

Hi all, completely new here to apologies if this is in the wrong place, or the wrong platform altogether -please move or redirect if either are the case!

I am planning a whole-house ESS/UPS comprising 8x Pylontech US3000C for 26.99kWh useable storage. Initially this will mainly be used to time-shift Octopus Agile/Intelligent/Go, but in future will also have PV input (size TBD). House has a 100A DNO fuse, UK 1P 240V/50Hz nominal.

Where I am struggling is:

  1. How many/which Victron inverter/chargers do I need if I have 4hrs in which to charger the bank from empty to full? More relevantly so I dot clutter the forum further, why? Currently looking at a single Multiplus II 5000/70 or equivalent EasySolar
  2. If this time is cut to 3hrs (Agile), how's does the answer to (1) change?
  3. How is this picture affected if I also have an EV charge point running in the same time window?

Off the back of this, I'll be looking at the PV side to understand crossover points as regards payback period etc. - but somewhere!

Thanks for any help; happy to provide more detail if meeded

colinb asked
wkirby commented ·

3 Answers

ESS not possible in the Netherlands, at least not without certification?

A Victron dealer (stroomwinkel-dot-nl) told me that none of the Victron charger/inverter combinations are certified for ESS usage in the Netherlands. Can anybody from Victron confirm or deny this? Seems a bit odd for a Dutch company not to have this in place.

And what if an ESS installation with a non-certified Victron product is used in the Netherlands, what could be the consequence?

evhaandel asked
Johannes Boonstra (Victron Energy Staff) answered ·

3 Answers

From mainland to island

I will soon have a 3-phase setup with a Fronius inverter AC coupled on the output of the victron system. The system operates grid-tied with ESS and in case of grid failure should then form a island with continued solar operation.

I know that the Fronius inverter is setup with a country code (for Germany) to be in compliance with the loca grid. So my, maybe stupid, question. What happens if the system goes from mainland (grid) to island mode?

Will I have to then change the config of the Fronius to work with the island setup? Or does it have to be changed already during setup of the AC coupling? Will the Cerbo GX handle the all changes in case of island mode or when mains comes back?

sesshoumaru asked
wkirby answered ·

1 Answer

ESS (Mode 3) - 3 phase - different MultiPlus 2 sizes


I am interested in adding a ac-coupled battery-system using a set of 3 MultiPlus 2 inverter to a already working pv-system.
Since there is a asymmetry in pv-inverter sizes (and in consumption too - heatpump on 1 phase) my favourite configuration would be the combined usage of 5kVA (L1, L2) and a 10kVA (L3) MultiPlus 2 units. Is this „asymmetric“ configuration in ESS mode 3 possible?



bbmz asked
bbmz answered ·

1 Answer

Maximale Wechselrichterleistung ESS 3 Phasensystem

Hallo Community,

ich habe ein 3 Phasensystem mit 3x MultiPlus 48/5000/70 installiert und in Betrieb genommen.

Soweit so gut. In den Einstellungen sind mir zwei Dinge noch unklar.

1. Phasenkompensation "einzelne Phase" od. " Summe aller Phasen" in Deutschland!

da ich nicht einspeise habe ich eigentlich keine Vorgabe meine Energieversorgers, oder!?

So bin ich den Empfehlungen von Victron zu "Summe aller Phasen gefolgt".
Habt Ihr hier andere Informationen wie die Einstellung sein muss, speziell in Deutschland!?


2. Maximale Wechselrichterleitung begrenzen!

Mein System wird über ein CCGX überwacht.
Betrachtet das CCGX das System komplett oder jeden einzelnen Wechseltrichter?

Ist die Einstellung also für die Summe der Ausgangsleistung oder für jeden einzelnen Wechselrichter relevant?


Danke für Eure Unterstützung.

argei77 asked
bbmz commented ·

0 Answers

2 ESS systems controlled by one VenusGX?

I am using AC coupling between a Multiplus and a PV inverter using a VenusGX

I want to have AC coupling on a second battery bank, second Multiplus and a second PV inverter, and I am wondering if I can use same VenusGX. I have a MK3 interface that I can use.

Is it possible? If so, how do I make the connections/ settings? I don't need any monitoring on the second system, I only want the second PV inverter to charge second battery bank through the second Multiplus.

Thank you so much.

solarman71 asked
Alexandra answered ·

1 Answer

Multiplus in ESS mode aansluiten op Belgisch net voor thuisbatterij.


Ik heb thuis een multiplus II GX aangesloten op het Net met een 10Kw lithium batterij.

Alles in mooi aangesloten zoals het in de manual beschreven staat en het systeem werkt ook gewoon perfect, Maar nu is de keuring langs geweest om het systeem te keuren en dat wilde hij niet doen omdat de omvormer in serie was aangesloten met het electriciteitsnet en niet in parallel. (Ik vertelde hem dat dit systeem enkel maar in serie kan worden aangesloten en dat alle meet apparatuur vanbinnen in de multiplus aanwezig is, en dat dit toestel aan alle veiligheids voorzieningen voldoet en gekeurd is door Synergrid belgie)

Kan iemand mij helpen met info of voorbeelden van iemand anders die dit ook zo gedaan heeft thuis, zodat ik dit kan voorleggen aan de keurder? Of heb ik zelf iets over het hoofd gezien?

In bijlage de schets van hoe het is aangesloten:



Met vriendelijke groeten


aaroncloet asked
maartenvt commented ·

13 Answers

multiplus-ii upgrade firmware 490 ESS behavior
After upgrading to 490, I noticed the multiplus sending too much power to the grid when the battery gets fully charged. After Soc get to 100, the grid feeding almost equals the PV output so the battery goes into discharge to cover ac loads. After a minute or two and Soc drops from 100, the system stops feeding in, and charges battery back up. This keeps up back and forth. PV production is fairly steady and so is the AC load. It almost looks like the multiplus trys to back off the grid input but it doesn't do it fast enough where it will completely stops feed in and switches to full PV power to charging battery. The difference is about 400 watts (which is the AC load) it pulls from battery during feed in, and backs down to 100-200 watts discharge from battery.

I also noticed later in the day around peak PV power, PV outputs drops to about 100 watts and will stay there for awhile, and then max out again. This happens back and forth as well, looking back at the vrm graphs. Toward end of day, behavior of self consumption looks normal drains battery down to set Soc and reverts back to grid. I have defaulted settings and set up ess assistant from scratch. Any help is appreciated! Thanks!!

Update: After some clouds came in today, and PV output was lowered, it looks like things have leveled out and is normal right now. Battery is idle and PV is holding the AC load and outputting the rest (200watts) to the grid. I have watched this behavior described above, all day with no clouds and this morning when it was clear until now.

Mulitiplus ii 48v dc 120v ac
Mppt solar charger 250/100 ve.can
Bmv 712 ve direct
Venus gx
Lifepo4 lithium battery internal bms- no communication



dray22 asked
dray22 commented ·

1 Answer

Assistance (ess)

Easy solar 5kva system, with 2 x mppts sys

When uploading ESS using VECONFIGURE, When done setting and want to upload it gives me and internal problem, contact victron energy. What could be the issue

sirrod asked
suttridge answered ·

1 Answer

Blue solar mppt 75/15 load cutoff

During my first initial charge/discharge cycle of a brand new 40 Ah LiFeYPO4 I had set load to "User Defined Algorithm1" to a cut off voltage of 10,5V. After leaving the battery with a load of ≈ 0,2A I got back this evening finding the voltage had dropped to 9,78V possibly killing my brand new battery.

What am I missing? Isn't the load settings supposed to cut of all current in the load terminals when voltage drops below cut off value?

I have no jumpers installed but the Blue Tooth dongle using the app to configure the MPPT.

Further more, toggling between always on/off does not have any effect. Load stays on all the time.

pontus asked
lucky commented ·

3 Answers

Anti-Islanding-Protection Austria (3-phase ESS-System with Fronius AC-coupled PV)


I am an electrician and planning a ESS-system for my new house in Austria.

3x Multiplus-II 5000 (3-phase) with 48V Lithium-Battery (maybe some Pylontech US3000), with about 6kWp Fronius Symo PV-Inverter connected on AC-Out for higher self-consumption and UPS in case of grid failure.

Is there an extra anti-islanding-relay necesarry, or is the anti-islanding-protection from the Multiplus II enough? I only find the TOR D4 Certificate for Multiplus-II 3000!

Thanks for the Answers!


Erwin Heigl asked
chesch commented ·

4 Answers

Multi Quattro - Fronius Primo - ESS - Dedicated Virtual Switch

Good morning to the community

I have a lot of doubts about the my system and can't find any answers.

I have a system of:

10KwHof solar panels.

PV solar Fronius 8.2

80 KwH of lithium batteries connected via Can Bus

Actually I am using the ESS assistant

Unfortunately I am very confused because my dealer insists that where I live (Kenya) it is not recommended to use ESS.

But it seemed to me the only alternative to have the Feed In 0. He tried it with contactor connected to a relay, but nothing worked well.

In ESS is worked well for a year, then there were problems with the charger section of the Victron the Victron was replaced promptly.

Now after another year I have a similar problem when connecting the mains the multi makes a lot of noise it switches from Bulk to Passtrough and disconnects the mains and does this all the time.

If I manually disconnect the grid the system works perfectly as an inverter.

I was considering the dedicated virtual Switch, to physically disconnect as much as possible, but how will the feed IN 0 work ?

Any suggestion?

Thank you

aldo asked
Alexandra commented ·

3 Answers

1074 Posts
684 Users

Topic Experts

374 Points
Rob Duthie
340 Points
309 Points